Is there anyway to measure the compression ratio of a motor that is fully assembled, besides taking it apart?

if you do not know the specs on the components the answer is no.

Thanks Mike!

Yep as said, specs ( CC's of head, piston dish or dome, deck height ect ) Good luck


John jr

Just say 10:1. That's what everyone says when they don't know. LOL.

Yes,

http://store.katechengines.com/whist...ster-p174.aspx

You'll have to find a local shop that has one.

Jeff

wow,never seen one of those.i cant see to many shops spending that on one when most engines taken to a machine shop will soon be torn down anyway.

Mike,

They are utilized mainly by sanctioning body tech inspectors to verify the legality of compression limited class engines.

Bob

if you have done enough engines and know the cranking compression of similar engine specs you can kinda guess..example my suburban is a 8:0 to 1 compression and my cranking psi is around 130.. my boat is 10; to 1 and its around 165 psi..

i can see a tool like that being useful for that.